Smok's QC is horrible overall, but you still might be lucky and get a good device.
Me personally, I didn't have any problems with Smok devices so far. My H-Priv, R200, Alien and G320 are still working fine. Even the Alien's paint is still in pretty good shape, except for the up/down buttons because of my wedding ring.
But I have to admit some of my friends were not so lucky with their Aliens. Theirs died after only half a year +- a few months.
So if you're willing to gamble or you can get it cheap, then go for it.